Approximately 60 votes didn’t have signatures, said Mickie Kawai of the Washington County Elections Division, and another 60 or so signatures could not be validated against voter registration records.

“These voters have 14 days to respond from Election Day,” Kawai said.

The disputed votes have not been counted yet. The measure is currently passing by 220 votes, according to returns released last week, with 51 percent of voters choosing “yes” and 49 percent choosing “no.”

The measure would require Tigard to obtain voter approval before amending its comprehensive plan to site light rail or bus rapid transit. The city would also have to send an annual letter to Metro, TriMet, the Oregon Department of Transportation, Washington County, the governor and the Federal Transit Administration, letting those agencies know its stance opposing high-capacity transit.

If the voters whose ballots have been challenged do not resolve their issues with the county, their votes will not count.

“On an average, very few people come in to correct anything after the fact,” Kawai said, adding that about five people have resolved their ballot issues so far.